io.questdb.network.Kqueue Maven / Gradle / Ivy
/*******************************************************************************
* ___ _ ____ ____
* / _ \ _ _ ___ ___| |_| _ \| __ )
* | | | | | | |/ _ \/ __| __| | | | _ \
* | |_| | |_| | __/\__ \ |_| |_| | |_) |
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*
* Copyright (c) 2014-2019 Appsicle
* Copyright (c) 2019-2020 QuestDB
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
package io.questdb.network;
import io.questdb.log.Log;
import io.questdb.log.LogFactory;
import io.questdb.std.Files;
import io.questdb.std.Unsafe;
import java.io.Closeable;
public final class Kqueue implements Closeable {
private static final Log LOG = LogFactory.getLog(Kqueue.class);
private final long changeList;
private final long eventList;
private final int kq;
private final int capacity;
private final KqueueFacade kqf;
private final int bufferSize;
private long writeAddress;
private long readAddress;
public Kqueue(int capacity) {
this(KqueueFacadeImpl.INSTANCE, capacity);
}
public Kqueue(KqueueFacade kqf, int capacity) {
this.kqf = kqf;
this.capacity = capacity;
this.bufferSize = KqueueAccessor.SIZEOF_KEVENT * capacity;
this.changeList = this.writeAddress = Unsafe.calloc(bufferSize);
this.eventList = this.readAddress = Unsafe.calloc(bufferSize);
this.kq = kqf.kqueue();
if (this.kq != -1) {
Files.bumpFileCount();
}
}
@Override
public void close() {
kqf.getNetworkFacade().close(kq, LOG);
Unsafe.free(this.changeList, bufferSize);
Unsafe.free(this.eventList, bufferSize);
}
public long getData() {
return Unsafe.getUnsafe().getLong(readAddress + KqueueAccessor.DATA_OFFSET);
}
public int getFd() {
return (int) Unsafe.getUnsafe().getLong(readAddress + KqueueAccessor.FD_OFFSET);
}
public int getFilter() {
return Unsafe.getUnsafe().getShort(readAddress + KqueueAccessor.FILTER_OFFSET);
}
public int getFlags() {
return Unsafe.getUnsafe().getShort(readAddress + KqueueAccessor.FLAGS_OFFSET);
}
public int listen(long sfd) {
writeAddress = changeList;
commonFd(sfd, 0);
Unsafe.getUnsafe().putShort(writeAddress + KqueueAccessor.FILTER_OFFSET, KqueueAccessor.EVFILT_READ);
Unsafe.getUnsafe().putShort(writeAddress + KqueueAccessor.FLAGS_OFFSET, KqueueAccessor.EV_ADD);
return register(1);
}
public int poll() {
return kqf.kevent(kq, 0, 0, eventList, capacity);
}
public void readFD(int fd, long data) {
commonFd(fd, data);
Unsafe.getUnsafe().putShort(writeAddress + KqueueAccessor.FILTER_OFFSET, KqueueAccessor.EVFILT_READ);
Unsafe.getUnsafe().putShort(writeAddress + KqueueAccessor.FLAGS_OFFSET, (short) (KqueueAccessor.EV_ADD | KqueueAccessor.EV_ONESHOT));
}
public int register(int n) {
return kqf.kevent(kq, changeList, n, 0, 0);
}
public void setReadOffset(int offset) {
this.readAddress = eventList + offset;
}
public void setWriteOffset(int offset) {
this.writeAddress = changeList + offset;
}
public void writeFD(int fd, long data) {
commonFd(fd, data);
Unsafe.getUnsafe().putShort(writeAddress + KqueueAccessor.FILTER_OFFSET, KqueueAccessor.EVFILT_WRITE);
Unsafe.getUnsafe().putShort(writeAddress + KqueueAccessor.FLAGS_OFFSET, (short) (KqueueAccessor.EV_ADD | KqueueAccessor.EV_ONESHOT));
}
private void commonFd(long fd, long data) {
Unsafe.getUnsafe().putLong(writeAddress + KqueueAccessor.FD_OFFSET, fd);
Unsafe.getUnsafe().putLong(writeAddress + KqueueAccessor.DATA_OFFSET, data);
}
}